JOHANNESBURG (Reuters) - Shares of Naspers fell more than 3 percent to four-week lows on Friday after China launched an investigation into its top social media sites, including the South African media company's subsidiary Tencent's WeChat.

JOHANNESBURG (Reuters) - Shares of Naspers fell more than 3 percent to four-week lows on Friday after China launched an investigation into its top social media sites, including the South African media company's subsidiary Tencent's WeChat.